It is a bug with the tablet driver software. Photoshop gets the coordinates from the OS, which gets them from the tablet driver software. Photoshop uses the OS APIs (WinTab or Ink on Windows, tablet events on MacOS) to get the information, and uses it directly. The only part here that could fail for some tablets and not others is the driver.

Plus, we've seen similar errors from off-brand tablet makers -- and they have to update their drivers to fix the bugs.

Photoshop does use more of the tablet APIs than most other applications, and does encounter more driver bugs because of that.

"off-brand"? Lol. Fascinating that I'm using this off-brand tablets for a really long time and I never had a problems like with Wacom products. I see Adobe is the only, like always. For people who are interested in graphic Hanvon is not an off-brand tablet maker...
Yeah I will try to update drivers, thank God I just bought subscription for Photoshop and I can withdraw my money if it don't work. :)
Thanks.